Financial Instruments Measured at Fair Value - AFS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Fair Value Measurement Contingent Consideration	$ 2,123
Marubun [Member]
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Investment Ownership Percentage	8.40%
Cost basis	10,016	10,016
Unrealized holding gain	2,709	(85)
Fair value, available-for-sale securities	12,725	10,101
WPG [Member]
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Investment Ownership Percentage	1.90%
Cost basis	10,798	10,798
Unrealized holding gain	24,903	29,784
Fair value, available-for-sale securities	35,701	40,582
Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost basis	15,614	15,271
Unrealized holding gain	5,817	1,949
Fair value, available-for-sale securities	21,431	17,220
Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, available-for-sale securities	69,857	67,903
Interest Rate Fair Value Hedge Asset at Fair Value		(10,832)
Foreign Currency Contracts, Liability, Fair Value Disclosure	(654)	(107)
Fair Value Measurement Contingent Consideration	(5,845)	(806)
Total Fair Value Assets And Liabilities Measured On Recurring Basis	63,358	56,158
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, available-for-sale securities	69,857	67,903
Interest Rate Fair Value Hedge Asset at Fair Value		0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Fair Value Measurement Contingent Consideration	0	0
Total Fair Value Assets And Liabilities Measured On Recurring Basis	69,857	67,903
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, available-for-sale securities	0	0
Interest Rate Fair Value Hedge Asset at Fair Value		(10,832)
Foreign Currency Contracts, Liability, Fair Value Disclosure	(654)	(107)
Fair Value Measurement Contingent Consideration	0	0
Total Fair Value Assets And Liabilities Measured On Recurring Basis	(654)	(10,939)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, available-for-sale securities	0	0
Interest Rate Fair Value Hedge Asset at Fair Value		0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Fair Value Measurement Contingent Consideration	(5,845)	(806)
Total Fair Value Assets And Liabilities Measured On Recurring Basis	$ (5,845)	$ (806)